I bought this tach and I'm waiting on it to arrive right now.Before it gets here,I want to be sure that I know how to install it so I can get it in immediately .

It's going to come with four wires,one power source,one ground,one illumination,and one for the tach signal.I have a question about the illumination and the tach signal.

Illumination -
I want the tach to light up as soon as my headlights are on.It doesn't have to come on with the markers...Just the headlights.Which color-coded wire coming out of the headlight switch will I need to splice into for the signal to illuminate my tach?

Tach Signal -
I'm installing this on the F-150 in my signature.Where will I need to put the tach signal wire,(i.e. the distributor,the ignition module,etc.).

Thanks for any insight.

Nightrain